CN106802014A - The built-in solution heat exchanger of absorption refrigeration unit - Google Patents

Abstract

A built-in solution heat exchanger of an absorption refrigeration unit, an absorption refrigeration unit and a refrigeration matrix using the solution heat exchanger, the solution heat exchanger is arranged in the absorption refrigeration unit, and is used to convert the Heat exchange between the low-temperature dilute solution and the high-temperature concentrated solution; including solution pipes for the inflow and outflow of the low-temperature dilute solution and high-temperature concentrated solution, and heat transfer wall plates for heat exchange, the solution pipes are the absorption type The side wall of the refrigeration unit fuselage is indented to form a groove, and the groove is combined with the heat transfer wall to form a channel for fluid to flow through. The solution heat exchanger of the small lithium bromide absorption refrigeration unit of the present invention has a more compact structure, is embedded in the side wall of the fuselage, and becomes a part of the fuselage shell, so that the outside of the fuselage shell is kept flat, and the strength of the fuselage is increased. , and will not affect the combination of refrigeration units, so that the refrigeration unit can be expanded into a large-scale absorption refrigeration matrix with doubled refrigeration power.

Description

Absorption refrigeration unit built-in solution heat exchanger

technical field

The invention relates to the production field of lithium bromide absorption refrigerators, in particular to a small absorption refrigerator which can be used as an independent unit of a refrigeration matrix and a built-in solution heat exchanger therein.

Background technique

Absorption chillers have the advantages of energy saving and environmental protection, and are easy to use new energy sources such as solar energy and industrial waste heat, and have been continuously developed. Miniaturization and familyization will be another trend after it is put into industrial application fields.

The lithium bromide absorption refrigerator was first used in the industrial field. It has high cooling power, large volume and heavy weight, and is made of metal materials. In the process of transforming from the industrial field to the miniaturized household field, its structure, materials and processing methods are basically inherited, and it is still made of metal materials. The body material is generally made of carbon steel, and the heat exchange pipes are generally made of copper pipes. Material. Correspondingly, the solution heat exchanger is mostly made of the same steel as the fuselage to make the shell, and copper tubes are used to make the heat exchange tube bundle. This kind of complex and heavy body design can no longer satisfy the development of absorption refrigerating machines in the direction of familyization and miniaturization.

With the emergence of new energy, new materials, and new processes and a large number of applications, traditional absorption refrigerators mainly made of metal materials have gradually been replaced by new materials. The market needs cheaper, lighter, more flexible installation and expansion, and modular absorption refrigerators, whose components are integrated with the body as much as possible, simple in structure, compact in size, and efficient in operation.

Contents of the invention

In order to solve the above technical problems, one of the purposes of the present invention is to provide a solution heat exchanger for the absorption refrigeration unit; the solution heat exchanger is a built-in solution heat exchanger of the absorption refrigeration unit. The so-called absorption refrigeration unit refers to a small lithium bromide absorption refrigerator with complete refrigeration function, which can be used alone or has the ability to be combined and expanded into a large-scale refrigeration matrix; the so-called built-in solution heat exchanger refers to the integrated in Inside the body shell of the absorption refrigeration unit, flow passages and heat exchange equipment are provided for the low-temperature dilute solution and the high-temperature concentrated solution in the absorption refrigeration unit.

The specific technical scheme is as follows:

A built-in solution heat exchanger of the absorption refrigeration unit, which is arranged in the absorption refrigeration unit, and is used for exchanging heat between the low-temperature dilute solution and the high-temperature concentrated solution in the absorption refrigeration unit;

The solution heat exchanger includes a heat exchange wall plate and a shell of the solution heat exchanger, and the heat exchange wall plate and the shell together form channels for a concentrated solution and a dilute solution;

When the low-temperature dilute solution and the high-temperature concentrated solution contact the heat-exchange wall plate through different channels, heat exchange is performed by the heat-exchange wall plate.

Further, the solution channel is a low-temperature dilute solution channel and a high-temperature concentrated solution channel separated from each other.

Further, the low-temperature dilute solution channel is provided with an inlet and an outlet for the low-temperature dilute solution to flow in;

The high-temperature concentrated solution channel is provided with an inlet and an outlet for the high-temperature concentrated solution to flow in.

Further, the heat exchange wall plate is a plurality of thin plates with the same shape and specification, which are arranged at uniform intervals in the inner cavity of the body of the absorption refrigeration unit.

Further, the heat exchange wall plate is a stainless steel plate, and there are textured convex lines formed by stamping distributed on the wall plate.

Further, the heat exchange wall plate is rectangular, and gaskets are placed on the edges to achieve the purpose of sealing, and form a solution channel together with the heat exchange wall plate.

Further, the inlet and outlet of the low-temperature dilute solution channel are respectively set at the lower left corner and the upper right corner of the built-in solution heat exchanger of the absorption refrigeration unit;

The inlet and outlet of the high-temperature concentrated solution channel are respectively arranged at the upper left corner and the lower right corner of the built-in solution heat exchanger of the absorption refrigeration unit.

Further, the gasket is provided with circular seals at two ports on one diagonal of the built-in solution heat exchanger of the absorption refrigeration unit, blocking the solution from flowing through the port, and at the same time connecting the other diagonal two ports of the line;

The positions of the circular seals on the gaskets in the two adjacent passages are reversed to form two passages for cold and hot fluid flowing along diagonal lines and separated from each other.

Further, the shell of the built-in solution heat exchanger of the absorption refrigeration unit is made of engineering plastics; the heat exchange wall plate is made of stainless steel.

The second object of the present invention is to provide an absorption refrigeration unit, which is provided with the above-mentioned built-in solution heat exchanger of the absorption refrigeration unit.

The third object of the present invention is to provide an absorption refrigeration matrix, including several absorption refrigeration units;

The absorption refrigeration unit is provided with a solution heat exchanger built into the absorption refrigeration unit as described above.

The beneficial effects of the present invention are:

The solution heat exchanger of the small lithium bromide absorption refrigeration unit of the present invention has a more compact structure, is embedded in the side wall of the fuselage, and becomes a part of the fuselage shell, so that the outside of the fuselage shell is kept flat, and the strength of the fuselage is increased. , and will not affect the combination of refrigeration units, so that the refrigeration unit can be expanded into a large absorption refrigeration matrix with doubled refrigeration power.

Description of drawings

Fig. 1 is a schematic diagram of the external structure of the absorption refrigeration unit and the installation position of the solution heat exchanger in the absorption refrigeration unit of the present invention;

Fig. 2A is a schematic diagram of the solution channel structure of the solution heat exchanger of the present invention;

Fig. 2B is a schematic diagram of the internal structure of the solution heat exchanger of the present invention;

Fig. 2C is a schematic cross-sectional structure diagram along line C-C in Fig. 2B

3A and 3B are schematic structural views of the gasket of the present invention.

Among them, some marks are as follows:

Water flow interface 105

Dilute solution flows into port 201;

concentrated solution outflow port 202;

Solution pump 203;

Concentrated solution goes to channel 204 on the shell side of the absorber;

Solution heat exchanger 205;

Inlet 206 for concentrated solution;

Connection port 207 for absorber solution distributor inlet;

Outlet 208 for dilute solution;

The dilute solution goes to the channel 209 of the regenerator;

Connection port 210 for the inlet of the generator solution dispenser

dilute solution channel 212;

concentrated solution channel 214;

Heat exchange wall plate 220;

Raised strip 222;

Washer 300;

Circular seals 304,308.

detailed description

The accompanying drawings constitute a part of this specification; various specific embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that, for the convenience of description, the present invention uses terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", etc. to describe various aspects of the present invention. example structural parts and elements, but these directional terms are determined only in accordance with the example orientations shown in the drawings. Since the disclosed embodiments of the present invention may be arranged in different orientations, these directional terms are for illustration only and should not be viewed as limiting. Where possible, the same or similar reference numerals used in the present invention refer to the same components.

Fig. 1 is a schematic diagram of the external structure of the absorption refrigeration unit and the installation position of the built-in solution heat exchanger in the absorption refrigeration unit of the present invention.

As shown in FIG. 1 , a lithium bromide absorption refrigeration unit 100 has a rectangular parallelepiped structure and is equipped with heat exchange components such as a regenerator, evaporator, absorber, and condenser (not shown in the figure). The lithium bromide absorption refrigeration unit uses lithium bromide solution + pure water as the working medium, in which pure water is the refrigerant water, and lithium bromide solution is the absorption liquid; the pure water evaporates and absorbs heat in the evaporator to realize the refrigeration function. After the refrigerant water absorbs heat and evaporates, it becomes refrigerant vapor. In the absorber, the refrigerant vapor is absorbed by the lithium bromide solution and becomes part of the solution, and is pumped to the regenerator together with the lithium bromide solution. In the regenerator, the refrigerant water is heated and regenerated together with the solution, and the refrigerant water evaporates from the solution and becomes a gaseous state again. Next, the refrigerant vapor is condensed into liquid in the condenser. The refrigerant water that has become liquid again returns to the evaporator to absorb heat and evaporate again. After the refrigerant water absorbs heat from the liquid-gas-liquid phase change, the refrigeration cycle is continuously carried out. Among them, cold water, hot water and cooling water flow in the heat exchanger tubes of the evaporator, regenerator, absorber and condenser for heat exchange. Therefore, the surface of the refrigeration unit 100 is provided with a plurality of cold water, hot water and cooling water inlet and outlet interfaces 105 that communicate with the outside world (heat source, cooling load, etc.); the outside world supplies the hot water required by the regenerator to the refrigeration unit through these interfaces 105, Cooling water for the evaporator, and cooling water for the absorber and condenser.

In the above refrigeration process, since the dilute lithium bromide solution has been cooled by the cooling water in the absorber, the temperature is relatively low. At the same time, the temperature of the concentrated solution flowing out of the generator is relatively high. To improve the thermal efficiency of the whole device, a solution heat exchanger is added to the system, which is the device shown in the rectangular area 120 on the side of the absorption refrigeration unit in Figure 1. The solution heat exchanger allows the high-temperature concentrated solution flowing out of the generator to absorb The low-temperature dilute solution flowing out of the generator is used for heat exchange, which can increase the temperature of the dilute solution entering the generator and reduce the temperature of the concentrated solution entering the absorber.

In Fig. 1, the solution heat exchanger 205 is arranged inside the side of the absorption refrigeration unit, and the outside is connected with the absorption refrigeration unit as a whole. The rectangular area shows the outer side of the heat exchange wall plate 220 of the solution exchanger 120 (see FIG. 2B for the inner side); the inner structure of the solution exchanger 120 is shown in FIG. 2A .

Fig. 2A is a structural schematic diagram of the solution heat exchanger and the solution channel of the present invention.

The solution heat exchanger 205 is a rectangular flat box structure, inside which a plurality of heat exchange wall plates (see 220 in FIG. 2B ) are arranged at even intervals to form a plurality of solution channels, that is, dilute solution channels separated from each other. channel 212 and concentrated solution channel 214. The dilute solution channel 212 and the concentrated solution channel 214 cooperate with the heat exchange wall plate 220 to form a closed heat exchange space. The low-temperature dilute solution and the high-temperature concentrated solution contact the heat exchange wall plate 220 at the same time, and the heat exchange wall plate 220 becomes a low-temperature environment. Dilute solution and high temperature concentrated solution heat exchange medium. The four corners of the solution heat exchanger 205 are also respectively provided with inlets and outlets of the solution channel, which are respectively: the concentrated solution inlet 206 in the upper left corner, the dilute solution inlet 201 in the lower left corner, the dilute solution outlet 208 in the upper right corner and the concentrated solution in the lower right corner. Solution outlet 202 .

The dilute solution from the solution pump 203 enters from the inlet 201 in the lower left corner, passes through the dilute solution channel 212 in the solution heat exchanger 205, is sent to the outlet 208 in the upper right corner, and then passes through the channel 209 and the connecting port 210 to the generator.

At the same time, the concentrated solution returned from the generator enters the solution heat exchanger 205 from the inlet 206, passes through the concentrated solution channel 214 in the solution heat exchanger 205, flows to the outlet 202, and then passes through the channel 204 and the connecting port 207 to the absorption device.

Fig. 2B is a schematic diagram of the internal structure of the solution heat exchanger body of the present invention; Fig. 2C is a schematic diagram of the cross-sectional structure along the C-C line in Fig. 2B

As shown in Figures 2B and 2C, the heat exchange wall plate 220 is a rectangle with the same shape as the solution heat exchanger 205, which is stamped from a stainless steel plate through a cold pressing process, and is stamped on the inner surface to form a number of dense vertical and horizontal patterns. The convex strips 222 are used to support the heat exchange wall plate to withstand the vacuum pressure, and make the fluid flowing through the convex strips generate turbulent flow to improve the heat transfer coefficient.

3A and 3B are schematic diagrams of the gasket structure of the solution heat exchanger 205 of the present invention;

In the solution heat exchanger 205 shown in FIG. 2C , the combination of the multi-layer heat exchange wall plate 220 and the gasket 300 forms a plurality of closed fluid heat exchange channels.

As shown in Figures 3A and 3B, the gasket 300 is a rectangle 304 and 308 with two circular seals on the diagonal, and the positions of the circular seals in two adjacent channels are just opposite; for example, in the previous channel The position of the circular seal 304 is the upper left corner and the lower right corner, and the position of the circular seal 308 of another channel adjacent to it is the upper right corner and the lower left corner. The circular seal 304 blocks the two ports in the upper left corner and the lower right corner, and connects the two ports in the lower left corner and the upper right corner at the same time; on the contrary, the circular seal 308 connects the two ports in the upper left corner and the lower right corner, and at the same time Block the two ports in the lower left and upper right corners. Arranged in this way, multiple channels for cold and hot fluids are formed in the solution heat exchanger 205, and the heat exchange surface is composed of multi-layer heat exchange wall plates 220, which increases the heat exchange area.

The flow channel 212 of the cold fluid (dilute solution) in the solution heat exchanger is a rectangular diagonal channel flowing from the lower left corner 201 to the upper right corner 208. Due to the blocking of the circular seal 304 on the gasket 300 in FIG. 3 , Cold fluid will not flow to the top left or bottom right ports.

The flow channel 214 of the hot fluid (concentrated solution) in the heat exchanger is a rectangular diagonal channel flowing from the upper left corner 206 to the lower right corner 202. Due to the blockage of the circular seal 308 on the gasket 300 in FIG. Fluid will not flow to the lower left or upper right ports.

In addition, the body of the solution heat exchanger 205 of the present invention is made of engineering plastics; the heat exchange wall plate 220 is made of stainless steel plate with good corrosion resistance. The thickness of the solution heat exchanger 205 is very thin, and can be embedded in the side wall of the fuselage of the absorption refrigeration unit to become a part of the fuselage. While completing the heat exchange function, the cross-sectional shape can also reduce the weight of the fuselage. , Strengthen the role of the fuselage strength.

Although the present invention will be described with reference to the specific embodiments shown in the accompanying drawings, it should be understood that, without departing from the spirit, scope and background of the teachings of the present invention, the built-in solution heat exchanger of the absorption refrigeration unit of the present invention and the use thereof Many variations of the absorption refrigeration unit and refrigeration matrix of the solution heat exchanger described above are possible. Those skilled in the art will also realize that there are different ways to change the parameters and dimensions in the disclosed embodiments of the present invention, which all fall within the spirit and scope of the present invention and claims.

Claims (11)

1. A built-in solution heat exchanger of an absorption refrigeration unit, which is arranged in the absorption refrigeration unit, and is used to carry out heat exchange between the low-temperature dilute solution and the high-temperature concentrated solution in the absorption refrigeration unit, and is characterized in that: The solution heat exchanger includes a heat exchange wall plate and a shell of the solution heat exchanger, and the heat exchange wall plate and the shell together form channels for a concentrated solution and a dilute solution; When the low-temperature dilute solution and the high-temperature concentrated solution contact the heat-exchange wall plate through different channels, heat exchange is performed by the heat-exchange wall plate. 2. The built-in solution heat exchanger of absorption refrigeration unit according to claim 1, characterized in that: The solution channel is a low-temperature dilute solution channel and a high-temperature concentrated solution channel separated from each other. 3. The built-in solution heat exchanger of absorption refrigeration unit as claimed in claim 1, characterized in that: The low-temperature dilute solution channel is provided with an inlet and an outlet for the low-temperature dilute solution to flow in; The high-temperature concentrated solution channel is provided with an inlet and an outlet for the high-temperature concentrated solution to flow in. 4. The built-in solution heat exchanger of absorption refrigeration unit as claimed in claim 1, characterized in that: The heat exchange wall plate is a plurality of thin plates with the same shape and specification, which are arranged in the inner cavity of the body of the absorption refrigeration unit at even intervals. 5. The built-in solution heat exchanger of absorption refrigeration unit as claimed in claim 4, characterized in that: The heat exchange wall plate is a stainless steel plate, and the textured convex lines formed by stamping are distributed on the wall plate. 6. The built-in solution heat exchanger of absorption refrigeration unit according to claim 1, characterized in that: The heat exchange wall plate is rectangular, and gaskets are placed on the edges to achieve the purpose of sealing, and together with the heat exchange wall plate, a solution channel is formed. 7. The built-in solution heat exchanger of absorption refrigeration unit according to claim 1, characterized in that: The inlet and outlet of the low-temperature dilute solution channel are respectively arranged at the lower left corner and the upper right corner of the built-in solution heat exchanger of the absorption refrigeration unit; The inlet and outlet of the high-temperature concentrated solution channel are respectively arranged at the upper left corner and the lower right corner of the built-in solution heat exchanger of the absorption refrigeration unit. 8. The built-in solution heat exchanger of absorption refrigeration unit according to claim 1, characterized in that: The gasket is provided with circular seals at two ports on one diagonal of the built-in solution heat exchanger of the absorption refrigeration unit, blocking the solution from flowing through the port, and simultaneously connecting two ports on the other diagonal. ports; The positions of the circular seals on the gaskets in the two adjacent passages are reversed to form two passages for cold and hot fluid flowing along diagonal lines and separated from each other. 9. The built-in solution heat exchanger of absorption refrigeration unit according to claim 1-8, characterized in that: The shell of the built-in solution heat exchanger of the absorption refrigeration unit is made of engineering plastics; the heat exchange wall plate is made of stainless steel. 10. An absorption refrigeration unit characterized in that: The built-in solution heat exchanger of the absorption refrigeration unit according to any one of claims 1-9 is provided. 11. An absorption refrigeration matrix, characterized in that: Consists of several absorption refrigeration units; The absorption refrigeration unit is provided with the built-in solution heat exchanger of the absorption refrigeration unit according to any one of claims 1-9.